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add an assert
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26178 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -367,7 +367,8 @@ BasicBlock *Loop::getLoopPreheader() const {
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Out = *PI;
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}
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// Make sure there is only one exit out of the preheader...
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// Make sure there is only one exit out of the preheader.
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assert(Out && "Header of loop has no predecessors from outside loop?");
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succ_iterator SI = succ_begin(Out);
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++SI;
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if (SI != succ_end(Out))
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